E-Books are books (or other documents or reports) delivered in electronic form, sometimes on CD-ROM or other media, but most frequently as files downloaded over the Internet. Most E-Books are intended to be read on the screen of an ordinary desktop computer, although very frequently users have an option to print them. Additionally, there are also some E-Books designed to be read on handheld electronic devices such as Portable Digital Assistants (“PDAs”), Pocket PCs and “E-Book Readers”.

In order to create an E-Book, an author first prepares their text and graphics, and then uses a software tool known as an “E-Book Compiler” to convert this material into E-Book format. As far as E-Books for PCs are concerned, the two most popular formats are PDF and EXE. There are advantages and disadvantages to both formats:

- PDF files are generally very good at representing paper documents. To display a PDF file, it is opened using the Adobe Acrobat viewer software, versions of which are available for Windows, Linux and Mac.

- EXE files are self-contained programs. They are intended to be used with Windows only, although to be fair, there are Windows-emulators available for Linux and Mac which will allow them to run many Windows programs. EXE files are usually prepared by compiling HTML files (the same format used for making web pages), and thus have the advantage that they can include interactive web-like features such as forms, JavaScripts, animated graphics, etc. The best EXE E-Book compilers also provide facilities that are not generally available in PDF such as a search function and password protection of pages within the E-Book.

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